In thinking about past Russian Imperial Family members, I was struck by this question or concept. How many[ i]paternal[/i]great grandmothers does one have ? I have one paternal (on my father's side) grandmother , but would I have two paternal great-grandmothers? I guess that's possible but it sounds funny.
Put another way,and making it more tricky, is my father's maternal[u grandmother my paternal great-grandmother? That is, paternal simply because it's through my father's family line?
This was triggered by a Romanov family reference, but it applies to any genealogy, and I wondered what the right word or expression wold be.